Was turned on to a new product (to me anyways) called Smart Water. Suppose to to good for keeping yourself hydrated. It contains Vapor Distilled Water and Electrolytes. And best of all (to me) it tastes like water and not some flavored drink. You can put it right in the old Camelback. I found it at Vons for $1.25 for 33.8 ounces. Check it out. http://www.glaceau.com/